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@mentallyalex @helplessduck @UnFitz2 @TazPoltorak
The best way to explain it I've found is like this:
You know how apples are red, right?
Even though many particular apples aren't actually red, might be green or yellow or some kind of mix, the "apple" concept is (for most people) kind of associated with "redness" in our mental model.
It's that, but instead of the concept of "apple", it's the concept of "the number 3" or "the letter C" or whatever.